Bulb fennelPermascaping
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Bulb fennel growing

Cool-season produce

Bulb fennel

Foeniculum vulgare var. azoricum

Also known as Florence fennel · Fennel bulb · Fennel

Choose Florence/bulb fennel, not ordinary herb fennel, if you want the grocery-store bulb. Stress and rising heat cause bolting before the base swells.

EdibleCool-season crop
Growing spaceVegetable bed
Climate fitUrban core · USDA 9b–10a · Valley suburbs · USDA 9a–9b · Desert outskirts · USDA 8b–9b
Crop familyApiaceae (carrot)
Life cycleAnnual crop
Phoenix planting windowOctober–November or February, with fall preferred for bulb quality.
How to plantDirect sow or transplant very young starts without disturbing roots.
Plant spacing10–12 in
FrostLight frost tolerated; protect young starts during hard freezes.
Time to harvestVariety-dependent; harvest swollen bases while tender
SuccessionSmall fall sowings 2–3 weeks apart.
Special categoriesEDIBLE
Typical harvestCut tender bulbs in winter or early spring; fronds are edible.

Right plant, right place

Will Bulb fennel grow at your Arizona property?

Choose Florence/bulb fennel, not ordinary herb fennel, if you want the grocery-store bulb. Stress and rising heat cause bolting before the base swells.

Best regional fit: Urban core · USDA 9b–10a, Valley suburbs · USDA 9a–9b, Desert outskirts · USDA 8b–9b.

Light

Sun exposure

Full winter sun; give leafy crops afternoon protection during warm fall and spring weather.

Water

Irrigation

Keep the vegetable root zone evenly moist with regular irrigation; adjust to rain, soil, and temperature rather than using a fixed summer schedule.

Planting & stewardship

How to help Bulb fennel thrive

  1. 1

    Prepare a fertile, well-drained bed and keep seed or transplants evenly moist through establishment.

  2. 2

    Thin to the final spacing; crowding reduces harvest quality.

  3. 3

    Watch for aphids and caterpillars and protect sensitive growth from a hard freeze.

  4. 4

    Harvest before sustained spring heat causes bolting or poor quality.

Read the growing reference ↗ Planting dates can shift with cultivar, weather, and your yard’s microclimate.

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